- 专利标题: A METHOD OF DETERMINING A GRADIENT IMPULSE RESPONSE FUNCTION DURING EXECUTION OF A MAGNETIC RESONANCE IMAGING OR SPECTROSCOPY SEQUENCE
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申请号: US15573284申请日: 2016-05-12
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公开(公告)号: US20180136298A1公开(公告)日: 2018-05-17
- 发明人: Bertram Wilm , Christoph Barmet , Klaas P. Prussmann
- 申请人: EIDGENOSSISCHE TECHNISCHE HOCHSCHULE , UNIVERSITAT ZURICH
- 申请人地址: CH Zurich CH Zurich
- 专利权人: EIDGENOSSISCHE TECHNISCHE HOCHSCHULE,UNIVERSITAT ZURICH
- 当前专利权人: EIDGENOSSISCHE TECHNISCHE HOCHSCHULE,UNIVERSITAT ZURICH
- 当前专利权人地址: CH Zurich CH Zurich
- 优先权: EP15167449.6 20150512
- 国际申请: PCT/EP2016/060740 WO 20160512
- 主分类号: G01R33/565
- IPC分类号: G01R33/565 ; G01R33/389 ; G01R33/58 ; G01R33/46
摘要:
A method of determining an actual gradient impulse response function during execution of a magnetic resonance (MR) imaging or spectroscopy sequence, wherein a main magnetic field is generated in a sample region of an MR apparatus by means of a main magnet and wherein superimposed time dependent gradient fields and radiofrequency fields in a first RF band are generated in the sample region according to a first MR sequence for forming images or spectra, the gradient fields being generated by gradient forming means of the MR apparatus operated according to a gradient forming sequence part of said first MR sequence, the MR apparatus further comprising at least one magnetic field probe. The method comprises the steps of: —operating said at least one magnetic field probe according to a second sequence, whereby a time dependent probe signal is repeatedly acquired from each magnetic field probe during a probe acquisition time window, thus providing at least one time dependent probe signal; —obtaining said actual gradient impulse response function by calculating an impulse response function from said at least one time dependent probe signal and from said gradient forming sequence part.